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Related Experiment Videos

Direct current conductivity studies on poly(3-methyl thiophene).

K L Yadav1, A K Narula, R Singh

  • 1Polymer Physics Group, National Physical Laboratory, New Delhi, India.

Applied Biochemistry and Biotechnology
|January 11, 2002
PubMed
Summary

Researchers studied the electrical conductivity of poly(3-methyl thiophene) using Mott's variable range hopping model. This analysis yielded key parameters, including density of states at the Fermi level, consistent with other conjugated polymers.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Science

Background:

  • Poly(3-methyl thiophene) is a conjugated polymer with potential electronic applications.
  • Understanding charge transport mechanisms is crucial for optimizing polymer-based electronic devices.

Purpose of the Study:

  • To investigate the direct current (DC) conductivity of poly(3-methyl thiophene) over a wide temperature range (77-300 K).
  • To analyze the conductivity data using Mott's variable range hopping model to elucidate charge transport mechanisms.
  • To determine key parameters governing charge transport, including density of states at the Fermi level.

Main Methods:

  • Direct current (DC) conductivity measurements were performed on poly(3-methyl thiophene) samples.
  • Experimental data were fitted to Mott's variable range hopping model.

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  • Mott's parameters, such as characteristic temperature (T0), average hopping distance (R), average hopping energy (W), and density of states at the Fermi level (N [E(F)]), were calculated.

    • Main Results:

    • DC conductivity measurements revealed temperature-dependent charge transport behavior consistent with variable range hopping.
    • Analysis using Mott's model allowed for the evaluation of characteristic temperature (T0) and average hopping parameters (R, W).
    • A realistic value for the density of states at the Fermi level (N [E(F)]) was obtained, aligning with reported values for similar conjugated polymers.

    Conclusions:

    • Mott's variable range hopping model effectively describes the DC conductivity in poly(3-methyl thiophene) within the studied temperature range.
    • The determined density of states at the Fermi level provides valuable insight into the electronic structure and charge transport properties of this polymer.
    • The findings contribute to the understanding of charge transport in conjugated polymers, relevant for organic electronics.